As for determining which animals have been strangled and not drained of their blood, we must understand that the focus was on the quantity of blood remaining in the meat of the animal. It was not the fact that the animal was strangled that kept it from being eaten, but the fact that it was never drained of its blood.
The Eocene constitutes the middle part of the Paleogene period (65-23 million years ago), preceded by the Paleocene and succeeded by the Oligocene epoch (34-23 million years ago); all of these periods and epochs were part of the Cenozoic Era (65 million years ago to the present).
The shortest era in geological time is the Cenozoic Era, the current era. It started 65.5 million years ago with the K-T extinction event. List from longest to shortest. Paleoproterzoic (2,500 - 1,600 ma) - 900 million years Mesoproterzoic (1,600 - 1,000 ma) - 600 million years Neoproterzoic (1,000 - 542 ma) - 458 million years